Gun-fire-control signaling apparatus.



F. w. woon. `GUN FIRE CONTROL SIGNALING APPARATUS.

APPLICATION FILED 0CT.24, 19H.

Patented 'May 16, 1916.

2 SHEETS-SHEET I.

A KR

wit-Mmes: Wig/M@ Frank PKI/V00@r F. Wl WOOD.

GUN FIRE CONTROL SIGNALING APPARATUS.

APPLICATION FILED 0CT.24. |914. v v

Patented Mayl, 1916.

2 SHEETS-SHEET 2.-

F NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

GUN-FIRECONTROL SIGNAIJING APPARATUS.

To all whom 'it may concern Y Be it known that I, FRANK W. Woon, a

s citizen of the United States, residing at Brooklyn, in the county ofKings and State of NewYork, have invented new and useful .Improvementsin Gun-Fire-Control Signalf ingApparatus, of which the following is aspecification.

. lio

This yinvention relates to gun-fire control apparatus such as 'em loyedin directing theI lire of heavy guns. g l usually ;ii-icludves laAV:sightin'gdevlce .such as uch control apparatus a telescope Snear thegun to be usedv ingiving the'gun the proper inclination to give thetrajectory ,which willl enable the shell to.

strike the target. The same apparatus may be used for giving the gun theproper deiiection `angle in a horizontal plane to allow for the changeof relative position of a mov.- ing target, or to allow for side winds.

The apparatus usually includes "a range l indicator which is controlledfrom a distant point such-as a control station,- in such a way that itindicates to the sight setter what elevation the gun should have. Y

The apparatus also usually includes an indicating member which indicatesto the sight setter when he has given the sight bar or telescope theproper elevation.

`One of the objects of the present yinven-l tionis to provide an'arrangement whereby these two-indications of which the sight setter mustbe cognizant, will be arranged so as Ato insure efficiency, and tend toprevent er- A further Object of the invention is tp prov1de anarrangementwhereby an indicating signal 'member which indicates therange'or elevation tothe sight setter, can be readily controlled from adistant point such .as a control station and which may, if desired, beadvanced at a uniform ratelso as to enable the indicator tosubstantially follow a target, the position or 'range of .which isconstantly changing; and a further object of the invention is to providean arrangement for enabling the gun sight to be quickly adjusted toassist in 'bringing the Specification of ietters Patent.

. Patented May 1e, i916.-

Application led Oetob-er 24, 1914. Serial No. 868,456.

. Further objects ofthe invention will appear more clearly hereinafter.

The invention consists in the general combination of parts and featuresdescribed hereinafter, all of which contribute to prO- UNITEDSTATESrATENToF-FICE.) Y

FRANK W. woon, or BnooxLY-N, NEW Yonx, AssIGNon To CHARLES conY a son,INC.,

following specification, while the broad v scope of my invention will bepointed out.

in the appended claims.

In the drawings z-Figure 1 is a diagram matic view showing an embodimentof my apparatus, away ;-Fig. 1a is a diagrammatic side elevation upon asmaller scale for illustrating the manner-in which such a controlapcertain parts being broken,

paratus directs the re of a gun. Fig. 2 is a cross section taken throughan indicating instrument which is embodied in this apparatus. Fig. 3 isa vertical section through the instrument taken about on the line 3 3of'F ig. 2. Fig. 4 is aplan showing a portion of the case' of theinstrument and illustrating the opposed arrangement -of the indicatingmembers..

Before proceedingto a detail description of this embodiment of theinvention, it will facilitate the disclosure thereof .to state that theapparatus preferably includes a sighting 'j device such as a telescopewhich is mounted on, or adjacent to the gun. A

In the normal position of the telescope and gun, their axes areparallel. The operation of bringing the gun to proper elevation -oradjusted angular position consists substantially in transmittingv to thesight setter a signal from the'control station indcating the range orinclination angle.

Suppose that the signal to the sight setter indicates a ten degreeelevation ofthe gun, the'sight setter then elevates the rear end of thesight bar or telescope to ten de- I grees. by rotating the telescope onits pivot so that the eye piece of the telesco e has a ten degreeelevation from normal. llhe gun spotter then elevates the gun on .itstrunnions, until he can see the target throu h the telescope. T he gunwill then have t e proper elevation to hit the target. This mode 'ofoperation is illustrated Iin Fig. 1a which shows the gun elevated.

Referring more particularly to the parts,

in the present embodiment of the invention, n

and of the gun in the'normal position are parallel. An observer whocomputes the ranges or angles for controlling the gun fire is supposedto be on look-out and sends information which he has to anoperator atthe control station 4, and this operator ,transmits a signal to each gunwhich is under his control, to direct the sight setter controlling thegun. While there may be 'as many guns as desired controlled from thecontrol station, in the present embodiment, l. have indicated one gunand l shall now describe the apparatus which prefer to use at the gunand at the control station.

In referring to Fig. 1, it should be understood that the parts of myapparatus are illustrated upon a greatly enlarged scale with respect tothe scale on which the gun itself is represented, and certain parts ofthe apparatus are out or' proportion to each other simply for the sakeof illustrating the preferred relation'of the parts.

The apparatus preferably includes at each gun, an indicator case 5 whichmay be of drum-shape as shown, and in this case prefer to provideelectrically controlled means 6 for advancing an indicating member 7which is the signal member controlled by the operator at the controlstation 4. Any suitable arrangement desired may be employed foradvancing this indicating member 7. I prefer however, to employ themechanism to be described more fully here` inafter.

Adjacent to the indicating member 7 there is a second indicating member8 arranged vwithin the same case, and the readings on the scales 9 onthese two indicatingl members 7 and 8 appear at a fixed point, that isin openings or windows 10 in the upper side of thecase. Preferablypassing through the axisA of the indicator case. 5, I provide aninner-shaft 11 which may be rotated at will by a hand wheel 12, theinner end of the shaftcarrying a pinion 13 meshing with the segment 14which is attached pivotally to the rear' end of frame 15 of thetelescope. When the hand wheel 12 is rotated, it will rotate theindicating member 8 and will also swing the telescope 2 on its pivot 3and change its angular position with relation to the gun 1. And theindicatingr member 8 will lindicate the adjusted position of -thetelscope.

In order to reduce the angular movement of the indicating member 7 bythe `electrically controlled mechanism 6, the shaft 16 which is drivenby the electrically controlled mechanism 6 operates through reducingmechamsm to drive the toothed -hub 18 of the indicating member, and asimilar reducing mechanism 19 is employed for driving {he goothed hub 20on the indicating mem- Referring now particularly toFigs. 2 to 4, Ishall describe some of these parts more in detail and show them ,intheir true relation and proportions. The electrically controlledmechanism 6 is preferably a step by step indicator comprising aplurality of poles 21 which are the cores' of electromagnets 22. Theremay be six of these poles or magnets and the axes of the coils'arearranged radially about the axis of the instrument, and thediametrically opposite coils are connected in pairs in series, in otherwords the coils -a, Fig. l, are connected, the coils b-f are connected,and the coils o-c are connected. lin the space surrounded by the poles,there is provided an armature or rotor 23 which preferably has four arms24. Fr'om this arrangement, if the coils a-a become energized by apassing current, the arm of the rotor 23 which is between the two coilsa and b will beattracted to the core of the coil a I'and this will givethe rotor a rotation 'through a twelfth of a revolution. f the currentnext passes in the coils b-b, the rotor will be given another twelfth ofa revolution. In this way, by energizing dierent pairs of coils insuccession, the rotor may be rotated continuously. f

The rotation of the rotor 23 is imparted with a reduced eiiect to thesignal or indicating member 7 through the mechanism 17, Fig. 1, whichreferably includes an eccentric 25 which 1s rigid with the rotor. Thiseccentric 25 is loosely mounted in an eccentric strap or sleeve 26 whichis in the form of a gear wheel, and as the eccentric 25 moves around,the teeth of this ear or eccentric strap 26 roll on the teet of a fixedepicyclic gear 27. The gear 26 has another set of teeth formed von aring 28 of a slightly different, diameter than the gear 26 but rigidtherewith, and the teeth of this ring 28 mesh with the epicyclic gear 29which is rigidly secured to the hub 18 of the signal or indicatingmember 7. This arrangement will result in producing a reduced advancingmovement of the indicating 'member 7 so that a graduated` scale 30 uponit will pass under a sight opening or window 31 inthe case 5.`

A similar reducing mechanism may be em- -ployed for rotatingthevindicating member 8 to advance its graduated scale 32 under itscorresponding window 33 in the case 5v.

For this purpose, the inner shaft 1'1 which is operated byhand isprovided with an ec- 35, a part of which is formed into a. pimon 36 andanother part of ips vcentric 34,- said eccentric rotatinglfreelyin theeccentric -strap w ch has attached thereto a pinion in the 180 23, Iprefer to provide form of a ring 37, the teeth of the pinion 36 meshingwith the teeth of an epicyclic gear 38 'fixed to a plate 39 within theinstrument, and when the 1 eccentric v34 turns around, the pinion 37engages the teeth of an epieyclic 'gear 40 on the hub 20 of the infdi'cating 4member 8. The indicating mem# `ber 8 has a neck 41 extendingtherefrom,

struction of this instrument as regards the manner of advancing'theindicating members, is immaterial and if desired, any suit- .ablereceiving instrument 'can be used for.

translating a signal to the indicating member 7. In the presentinstance, in order to control the energizing ofthe different coils inthe manner suggested above, I prefer to employ a circuit closing devicewhich may be rotated, and as it rotates it will touch certain contactswhich will have the effect vof throwing the electric current into theproper conductors to give the rotor; its advancing movement. In the`present instance, 43 indiv cates such a circuit closing device which hasthe simple form of a vcontroller drum adj acent to the surface of whicha plurality of brushes or contacts 44,- 45, 46, vand 47 are provided.

A t the control station and near the operators position so as tobe'visible by him, I prefer 4to provide! an indicator 48 which isadvanced in the same way by the circuit closer-43 as the indicating.member or signal 7.y In other words, this instrument 48 has threelpairs of oppositely disposed coils namely a-a, b-b and c-ccorresponding in position with the-correspondingly'indiwords, aconductor .48 connects the coils a" cated coils'of the other instrument`which is -at thel gun, andthe coils are preferably wired Vin parallelwith the corresponding coilsl at thel othery instrument. In other and A,and thecnductor 49 connects the coilsb" and-B', andthe conductor 50connectsv the coils c" and C. The coils b, c and a are all connectedto'v the conductor 52 which connects to a conductor 51 which connectswith the coils B,` C and A.

hen desired, .by v means of its'hand wheel 54; the contact 47 is` alwaysin contact with the surface of the drum and is connected with the returncon-- ductor 56 which is attached at 57 to a return The drum 53 isrotatedl main 58. When the drum 53 is turned, contact is first madeby.ity with the contact or brush 46 which energizes the coils a, aand A,A', next the coils b, b and B, B vwill be energized and so on around sothat the indicating member 7 will be advanced and in Synchrony with itwill'be advanced the indi-I `cating needle '59 of the instrument 48.

Evidently this drum 53 may be rotated forward and back, andwhenv it isrotated, the indicating members 7 and 59 will have a corresponding' and'-a synchronous movement. In this way. the operator can signal the properrange or gun elevation vto the sight setter, -and atV the same time hisyown indicator 48 will4 indicate the character of the signalthat istransmitted to the gun.

Where the gun is to be fired at a moving target such as aA moving ship,it is desirable to provide an arrangement whereby-the in.-

struments are driven automatically to v'substantially indicate theincreasing range so that a constant signal is being transmitted to thegun which is approximatelycorrect,

I provide hand controlled means'whichcan be operated at the will of theman atthe control station,'for correcting this approximate'signal sothat it will be accurate. For this purpose, 1I prefer to provide a motorwhich is preferably an electric motor 61,

said motor having a driving connection 62 'with a variablespeed device63; Any suitable mechanism m'ay be'used for this pury pose, preferably acontinuously rotating v disk 64 which operates to drive a wheel 65 whichris feathered' to `a shaft 66 extending diametrically across above thedisk 64. The

shaft 66 drives the drum 53 through a clutch 67 including a movableclutch member 68 controlled by a lever69. isA moved toward .the right,the clutch is opened and the drum 53 can then only be rotated by hand. I

It willy be evident that with .the Wheel set at a certain position, thevmotor 61 will drive the drum 53 at a uniform rate of-rotation andvhence the indicating members will be advanced at a uniform rate. In

order 'to enablethis rate of advance of the l indicating members to beaccelerated or -removable bracket 70 which moves as a nut on theadjusting screw 71,- said adjusting screw having a handle 72 whichcmaybe rotated by hand as desired. Above the screw -71 a scale 73 isprovided for indicating the rate .of movement of the indicatingmembers.. -With this arrangement, evidently. if the target is movingaway from the gun, the indicating member 7 at the gun can be operated sothat the reading of this scale indicates a higher and higher elevationto'be given to the gun. This elevation or' angle will be approximatelycorrect-but can'be corrected or adjusted from-the control station toagree with the last information had from the observers position. Thiscorrection is of course, made When the lever 694 tion or the other.

In order to provide means for automatically closing the circuit throughthe electric motor 61 when the clutch 67 is closed, I prefer toprovide'the lever 69 with an arm 7 5 which will closea. doubleswitch 76when the lever is rotated toward the left.

A test device is provided for insuring that the indicating member 59 andthe indicating member 7 will be in synchrony; for this purpose I preferto provide a signal such as an electric light 77 to which a conductor 78runs from a contact plate 79, and

when the member 7 advances to a certain point indicated by the scale,the contact 79 will be connected W-ith an extension 80 of the conductor51 by means of a ciontact 81 carried on the indicating member 7. Theconductor 51 is connected with `the minus side of the line and the plusside of the line has a conductor 82 which is a main li-ne leading inbetween a plurality of lights 77 similar to the light or signal 77.

Assuming thatV the signal or light 77 is supposed to become active whenthe indicating member 7 indicates some arbitrary number such as 10,000yards, when this signal is active, the indicating number or needle 59will also note 10,000 yards.

The signals '77 are .connected by conductors 8,3 with the indicators ofthe guns controlled from the same control station. Referring again tothe control drum 53, it is needless to go into details as to itsconstruction, it isot1 any common form preferably of the type in whichthe .bearing surface is formed with gaps 53'd which determine which ofthe brushes will be maintained in contact with the drum.

Current is constantly supplied to the apparatus when the double switch84 is closed,

' and whether the motor is being driven or not; the switch 7 6 is simplya motor switch. When the switch 84 is ,closed the'positive line 85 andthe negative line 86 are connected respectively with the conductors 82and 51, if desired through suitable fuse connections indicated at thepoint 87.

I shall now describe the general mode of operation of the apparatus.

An observer at the look-out station transmits his information orcalculation to the control station where the operator is located and inthe vicinity of the controller 53. If

the apparatus is being controlled entirely by hand, the clutch 57 isopened and also the switch 76; the operator in the control stationsimply rotates the wheel| 5 4 and brings his indicating member'59 to thepoint corresponding to the rangev or angle to .be

o'iven to the gun; this same signal is transmitted to the sight setterthrough the medium of the electrically controlled indicating member or.signal numberY 7. The ,sighthave the proper -elevation to strike thetar- V Get. D In case the target is moving, for instance away J)from thegun, the range will be 1ncreasing and usually such increase will be at aconstant rate. In such a case, the operator will employ the mechanicalmeans for 'assisting in maintaining the gun near its proper elevation.In order to do this, he closes the clutch 67 which starts the motor 61,and by adjusting the wheel 65 tothe proper point, he can cause thecontroller 53 to be rotated at the proper speed to advance theindicating number 7 at substan tially the proper rate, such that it willcompensate for the changing range and give approximately the properrange. From time to time however, the operator atl the control stationwill be given the result of a range observation or calculationby meansof which he can correct the indicators to make them more exact. Thiscorrection is made effective by rotating the handle 72 forward or back.

A typical circuit through the instrument and by means of which theelectrically controlled indicating members thereof are advanced is asfollows. The line 85, switch 84, conductors 82 and 56 to the contact 47,through the drum 53 to contact 46 and by the conductor 48 toward theright through coils ALA', to the conductor 52 and then through switch 84to the line wire 86; from ICO brush 46, toward the left on conductor 48affected by the range of the target, it is obvious that the sameapparatus may be used for controlling the gun with respect to deflectionangles.v

It is understood that the embodiment of the'invention described hereinis only -one of the many embodiments or forms the invention may take,and I do not Wish to be limited in the practice ofmy invention, nor

.in my claims, to the particular embodiment said electro-magnetic means,a clutch for `numbers of the other scale.

combination', a rotor near the gun position, electro-magnetic means andcircuits therefor, hand operated means at a central station forcontrolling the vcircuits through said electro-magnetic means to'edect astep by step. rotation of said rotor, an indicating member having ascale and driven at an increasedv rotary speed from said rotor, anotherindicating member also having a scale corresponding to said first namedscale, and

hand operated means for actuating said last named indicating member tobring the corresponding numbers of the scale thereof into alinement withthe numbers of the other scale. l

2. In' a gun-fire control apparatus, incombination, a rotor near the gunposition, electro-magnetic means and circuits therefor,

motor actuated `means at a central. 'station for controlling thelcircuits through said electro-magnetic means to effect a, step-bysteprotation of said rotor, an indicating member having a scale and drivenat an increased rotaryspeed -With respect to and from said rotor,another indicating member also having a scale corresponding to saidfirst named scale, and hand operated means for actuating said last namedindicating member to bring, the corresponding numbers of the scalethereof into alinement With the 3. In4 a gun-fire control apparatus, incombination, a rotor near the gun position, electro-magnetic'means andcircuits therefor, -a motor and hand operatedmeans at a central st ationforcontrolling the circuits through connecting the motor at will andenabling either the said hand operated meansorthe motor to be used toeffect the closing of the A. circuits through said electro-magneticmeans to veffect a step-bystep rotation of said rotor,

for controlling lan indicating member having a scale with a plurality ofnumbered divisions and driven vat an increased. rotary speed from saidrovtor, another indicating member also having. a scale with a-pluralityof numbered divisions corresponding to said rst named' scale, and handoperated means, foractuatf ing said last named indicating members to Abring the correspondingl .numbers yof the with, the numbersof the otherscale.

4. I-n a `gun-Ere control apparatus, in comscale thereof intoalinement'at a fixed point 4bination, av rotor near the gun position,elecy tro-magnetic means and circuits therefor,

motor actuated means at a central station the circuits through saidelectro-ma etic means to effect a step-bystep-rotation of said rotor, an'indicating' member having a scale and .driven at an increased rotaryspeed With respect to and` from said rotor, another indicating member ascale corresponding to said also having scale, hand operated means foractuating said last named indicatingeinemi ber to brin the correspondingnum step rotation of said rotor, an indicatingA member having a scaleand driven at an in- 'cr'eased rotary speed with respect to and fromsaid rotor, another indicating member also having a scale correspondingto said first named scale,'hand operated means for actuating said lastnamed indicating mem-v berv to brin the corresponding numbers. of

the scale t ereof into alinement with the' numbers of the other scale,the circuit-controlling means including a drum driven from the motor,and means -for varying the speed of driving said drum by thenmotor tochange the rate of closing the ivcircuits through said electro-magneticmeans.

6. In' a gun-re control apparatus, in

combination, an indicating member for in# dicating to the sight setterthe angular adjustment to be givenhthe gun to hit a distant relativelymoving target, a second indicating member arranged to show the angularadjustment of the sighted gun, means for continuously ladvancing vsaidlirtst indicating member Aat a 'substantially uniform rate to compensatefor the chan e ofv lange, and a hand controlled device or advancing saidsecond indicating member to bringthe. rea-ding thereof intocorrespondence with said iirst indicating member While said first md1cating member is in motion.- y

.7. In a gun-fire control apparatus, in combination, an indicatingmember having a scale for indicating to the sight setter the angularadjustment to be given the gun to hit a distant moving; target, a'secondsindieating member for indicating'the. vangular adjustment ofthesight, and'having asca'le similar to the first scale, alongside said rstindicating ,niember sothat both said rs ofv the scale t ereof intoalinement with the numbers of the other scale, and means for iosindicating members can be read simultaneously, means for advancing saidiirst indi eating member at a substantially uniform rate to compensatefor the change of range,

and a hand actuatedndevice for advancing.

said second indicating 'member to bringl the reading thereof intocorrespondence with said first indicating member while said indicatingmember. is in motion.

8. In a gun-fire control ap aratus, 1n com- .'bination, an indicatingmem r for indicating to the sight setter the an laradjustf ment to begiven the n to'- 1t a4v distant moving target, a secon, indicatingmember first iso - correspondence with said rst named indicating member.

9. In a gun-re control apparatus for directing lire at a moving target,in combination, an electrically controlled indicating member having ascale for indicating at a fixed point to the sight setter the angularadjustment to be given the gun to hit the moving target, a secondindicating member having a scale to show the angular adjustment of thesighted gun, a motor, circuits leading from a control station to saidfirst named indicating member, a circuit closing device driven by saidmotor for closing said circuits to advance :said first named indicatingvmembei" at a substantially uniform rate to compensate for the change ofrange,-

and hand-controlled means for advancing said second indicating member tobring the reading on the scale thereof vinto correspondence withthe-reading on the scale of 'said first indicatingfmexnber while saidfirst indicating member is moving.

10. In a gun-re control apparatus for directing fire at a moving target,in combination, anelectrically controlled indicating member having ascale for indicating to the sight setter the angular adjustment t0 begiven the gun to hit the moving target, a second indicating memberhaving a scale to show the angular adjustmentof the gun, both saidscales constructed to be read at a fixed point, a motor, circuitsleading from a control station to said first named indicating member, a,circuit closing device driven by said, motor forclosing said circuitsto advance said first named indicating member vat a substantiallyuniform rate to compensate for the change of range, and handa'ctuatedmeans for advancing 'said second indicating member to bring the reading,on the scale thereof into correspondence vvitn the readingon the scaleof said rst indicating member While the same isv in motion, and ahand-controlled device at the control station for varying the rate of-driving of said circuit closing device.

.11. In a gun-lire contro'l 'apparatus for directing re at a movingtarget, in combination, an electrically controlled indicating memberhaving a scale for indicating to the sight setter the angular adjustmentto be given the gun to hit the moving` target, a second indicatingmember having a scale to show the angular adjustment of the sighted gun,both said scales constructed to be read at a fixed point, a motor,circuits leading from a control station to said first named indicatingmember, a circuit closing is in motion, a clutch for driving said cir- Ycuit closing device from said motor, arranged to be opened at will, andmeans for actuating said circuit closing device by hand.

l2. In a gun-fire control apparatus for directing lire at a movingtarget, in combination, an electrically controlled -I indicating memberhaving a scale With a pluralityl of divisions for indicating to thesight setter the angular adjustment of the gun to hit the moving'target,a second indicating member having a scale with a plurality ofdi'visionsto show the angular adjustment of the sighted gun, a motor, conductorsleading from a control station to said firstA named indicating member, avcircuit closing device for lcontrolling the {iov/1 of current throughsaid conductors to advance said first named said motor to advance saidfirst named indicating member at a substantially uniform rate andthereby compensate for al change of range, hand actuated means foradjust: ing said variable speed device While in ops eration to changethe speed of driving said circuit closing device, and hand-actuatedmeans for advancing said second indicating member to bring the readingon the scale thereof into corres ondence with the reading on the scaleof sa1d rst indicating member While the latter is moving.

13. In a gun-lire control apparatus for directing lire at a movingtarget, in combination, an electrically controlled indicating memberhaving a scale with a plurality of divisions for indicating to thesightsetter the angular adjustment to be given the gun to hit the movingtarget, a second indicating member arranged adjacent to said rstvspondence with the reading on the scale of said first indicating member.

14. a lgun-fire control apparatus for directing fire at a moving target,an elecizo "trically controlled indicating memberliaving a scale with aplurality of divisions for indicating to the sight setter theangular-adjustment to be given the gun to hit the moving target, asecond indicating member havy ing a scale with a plurality of divisionsar-A y thereadng on the scale thereof into corre-- spondence with thereading on the scale of` ranged to show the angular adjustment of thesighted gun, an electric motor, -a"`circuit closing device forcontrolling said rst named indicating member, a clutch for vdriving saidcircuit closing devicefrm said motor, a member for simultaneouslyAclosin said clutch and closing a circuit. through said motor'to'drivethe motor, means for actuating said circuit closing device byV hand,'and hand-actuated means for advancing said second indicating memberftobring said first indicating member."

1,5.;-In'fa' gun-fire control apparatush in combination, anzindicatingmember having a scale for-indicating to the sight setter the angularadjustment ,to be given to the gun to hit aldistan't target, a secondindicating member having a. scale to indicate the position of thesighting telescope, an indicator at the control station, said indicatorand said first named indicating member having a pu'rality of. poles andelectrically controlled means associated therewith for ad- 'vancing theindicating .members with 1a step-by-step movementin synchrony, means atthe gun for advancing said second named indicating member to bring thereading on the scale of said second indicating member intocorrespondence with the reading on the scale of said first namedindicatingmember, and a signal Aat the cntrol station for indicatinwhether said indicator and -the first na ed indicating member, are` insynchrony.

16. In a gun-fire control apparatus for directing fire at a movingtarget, in combination, 'an electrically controlled indicating memberhaving a scale for indicating to the sight setter the angular adjustmentto be given the gun to hit the moving target, a second indicating membercoperating therewith to show the angular adjustment of the gun sight,amotor at a lcontrol station, a contact drum actuated thereby forelectrically controlling the advance of said first named indicatingmember, a -hand ac my handl in presence of two subscribing witnesses.

FRANK W. WOOD.

Witnesses: l,

` F. D.. AMMEN,

L. ELFMAN.

